r244093 - in /trunk/gcc: ChangeLog gcse.c ifcvt...

[law@gcc.gnu.org]

Author: law
Date: Thu Jan  5 07:38:48 2017
New Revision: 244093

URL: https://gcc.gnu.org/viewcvs?rev=244093&root=gcc&view=rev
Log:
	PR tree-optimizatin/78812
	* rtl.h (contains_mem_rtx_p): Prototype.
	* ifcvt.c (containts_mem_rtx_p): Move from here to...
	* rtlanal.c (contains_mem_rtx_p): Here and remvoe static linkage.
	* gcse.c (prune_expressions): Use contains_mem_rtx_p to discover
	and prune MEMs that are not at the toplevel of a SET_SRC rtx.  Look
	through ZERO_EXTEND and SIGN_EXTEND when trying to avoid pruning
	MEMs.

	PR tree-optimization/78812
	* g++.dg/torture/pr78812.C: New test.

Added:
    trunk/gcc/testsuite/g++.dg/torture/pr78812.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/gcse.c
    trunk/gcc/ifcvt.c
    trunk/gcc/rtl.h
    trunk/gcc/rtlanal.c
    trunk/gcc/testsuite/ChangeLog